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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66ffaed28e76195209ec858dd0b291b2113761fcdc9c8378667c49ef6e1c976' 
  AND token = 'mX8A0FTgO72hjnM+Hf9fbWZ+wxVNjHPv8EhECHXBfi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}